The CSV1A would be set at about 55 PSI because you have a 62 gallon size tank that holds 15 gallons of water. The CSV will maintain 55 PSI constant when running a shower and 45 PSI constant when running 11 GPM sprinkler zone and the pump won't cycle off until you stop using water. The CSV set at 55 PSI won't do anything until your tank is filled to 55 PSI, so when you stop using water it will refill the last 3 gallons in the tank from 55 to 60 at a rate of 1 GPM, which will take about 3 minutes. The CSV setting is different for different size tanks so it doesn't take too long to fill the larger tanks. In this way the CSV will work with any size tank. But as long as you are using more than 1 GPM the CSV keeps the pump running continuously. Because the CSV is keeping the pump from cycling on/off the size of tank is almost a moot point and can be very small.